Hardness critical item
A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5965-01-364-1232
NSN 6130-00-827-1967
NSN 2925-01-587-3956
NSN 5930-01-514-7429
NSN 5920-01-550-5868
NSN 5910-01-436-7525
NSN 5945-01-100-3654
NSN 5998-00-131-2760
NSN 2925-00-802-9387
NSN 5996-00-292-5394
NSN 6650-00-585-1850
NSN 5965-01-462-4079